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In this paper, 3D dual impeller stirring tank was used as a model to simulation combine with experiments to explore the acid leaching kinetics of high-calcium and -silicon manganese ores. The effects of stirring speed, temperature, and aeration rate on the spatial distribution of gas and liquid phases were investigated, and the influence of the gas phase on the flow state was further explored by using CFD (Computational Fluid Dynamics). Meanwhile, the effects of stirring speed, temperature, and aeration rate on the leaching rate of target element manganese were studied by experiments. According to simulations and experiments, stirring speed at 500 rpm perfectly. The aeration rate was 7 m/s, the suitable leaching temperature was 140 °C by experiments. These results also showed that the leaching of high-calcium and -silicon manganese ores follows the control of Interface chemical reaction.The apparent activation energy of the reaction was 43.4 kJ.mol−1. [ABSTRACT FROM AUTHOR]

Postmortem catabolism of Adenosine Triphosphate and Adenosine Triphosphate-related compounds, K value, pH, and texture of crucian carp were investigated during storage in ice. ATP and Adenosine Diphosphate degraded to Inosinic acid within 48 hours postmortem. There was a good relationship between pH value and IMP concentration (r = −0.753), IMP reached a top point at 3.33 ± 0.17 μmols/g in 4 hours postmortem; meanwhile, Hypoxanthine reached a bottom point at 0.038 ± 0.0052 μmol/g. K value increased linearly (r = 0.96) from an initial value of 0.54 to 1.66% in 48 hours postmortem. Texture analyses results suggested that rigor mortis lasted about 1 hour postmortem, after resolution of rigor, hardness, gumminess, and chewiness decreased in accordance with storage time (r = −0.88,−0.78, and −0.78, respectively). Those results indicated that it was better to effectively utilize the crucian carp in 2–4 hours postmortem. The K value might not be a good indicator to monitoring the loss of freshness of crucian carp during storage in ice since the K value was much lower than marine fish. [ABSTRACT FROM PUBLISHER]